How to create SIP Stateful or stateless proxy for VoIP

Once upon a time we had a school project where we had to implement SIP stateful proxy. I took this serious and created rich document describing possible problems and solutions working with JainSIP for Java.

Without further adduce I present you google doc containing questions and answers.

Slovak Version

I have also implemented SIP to XMPP gateway. If anyone is ever interested in this, feel free to contact me and I can provide you source code of my solution.

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